<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
		function fo() {
			var a = 1;
			this.fn = function() {
				alert(a)
			}
		}
		var f =new fo();
		f.fn();
		
		</script>
	</body>
</html>
